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On the correlation between surface roughness and work function in copper.

W Li1, D Y Li

  • 1Department of Mechanical Engineering, Changchun University, Jilin 130022, People's Republic of China.

The Journal of Chemical Physics
|March 3, 2005
PubMed
Summary
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Work function (WF) decreases as surface roughness (SR) increases for copper surfaces. A new capacitor model accurately predicts this relationship, aiding Kelvin probe technique applications.

Area of Science:

  • Materials Science
  • Surface Science
  • Physics

Background:

  • Surface roughness (SR) and work function (WF) are critical surface properties.
  • Understanding the SR-WF relationship is essential for Kelvin probe technique applications.
  • Copper surfaces are widely used in various technological applications.

Purpose of the Study:

  • To investigate the relationship between surface roughness and work function in copper.
  • To develop a theoretical model correlating SR and WF.
  • To validate the model with experimental data.

Main Methods:

  • Atomic Force Microscopy (AFM) for measuring surface roughness.
  • Scanning Kelvin Probe (SKP) for measuring work function.
  • Development of a capacitor model using sine functions.

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Main Results:

  • Work function of copper surfaces decreases with increasing surface roughness.
  • The proposed capacitor model accurately predicts the experimental WF values.
  • The model demonstrates good agreement between theoretical predictions and experimental results.

Conclusions:

  • A direct correlation between surface roughness and work function in copper was established.
  • The developed capacitor model provides a valuable tool for understanding and predicting WF based on SR.
  • The model enhances the application of the Kelvin probe technique for surface characterization and can account for tip geometry effects.